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I've looked through some of the headlight threads, but my question is more basic than "I want more light" etc. I'm not sure I understand what the hell I've got on my 79 400F--it doesn't appear to be the same as the Yamaha parts page. The headlight "lens assembly" in my case (see the pic)...

That is, I have stronger exhaust coming out of the right side than the left. Is this indicative of a problem in cylinder 1? The bike, a 79 XS400F, starts easily and idles nicely. But even at idle I can feel a marked difference between the two sides. I can't answer much about how it is on the...

Are there really no aftermarket petcocks out there for my bike? Every bloody one I see listed on Ebay that says it's for my model then shows that the space between the bolt holes is 34mm. My bolt holes are 46mm apart. Meanwhile, I have the rebuild kit from Mike's but I don't see how one is...

When I got my bike, a 79 XS400F, the rear master cylinder was in parts in a tub. Inspection showed a leak in the reservoir, which I believe I fixed by "welding" the plastic with a soldering iron. The seals look great. But here's the puzzler: the piston (55mm) seems to be too long for the bore...

So, I've been working on this 79 XS400F that I picked up a month ago. Owner said it would only idle with the choke, and I think I just found the cause while planning a carb clean and refurb. It appears that both carbs have pilot screws that have the tip broken off and plugging that port :-(...

I've looked through some of the threads on seats, and didn't see an answer to this...forgive me if it's out there already. I have a 79 400F with the side hinges that came to me with no seat. I've found a side hinge seat on fleabay but it will need to be re-covered. I gather that only a couple...

My 79 XS400F did not come with a seat, so I'm looking for one, the side hinge type. Thanks!

Greetings! Yesterday I took delivery of a 79 XS400 with 18,000 miles on the odo--don't know if that total is correct. I bought the bike as a project and I'll be sorting through its needs over the next week or so. I have one issue I need to look into now, but I'll start a thread on that if I...